Answer:
d The chemicals had to be applied to a plate, in the dark.
c The photograph had to be made and developed while the chemicals were still wet
Step-by-step explanation:
Darkrooms used red lighting to allow photographers to control light carefully, so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process
This meant that the photographer had to have a dark room with him, as well as various dangerous chemicals that were necessary for the development of the photo.
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